This minimalist card holder from Puro Wallets is constructed from CNC-machined aluminum alloy. The design features two rigid metal plates held together by high-tension elastic webbing, allowing the internal compartment to expand or contract based on the number of cards inserted. It accommodates between 1 and 18 standard-sized credit or identification cards. The outer plates provide integrated RFID-blocking protection to prevent signal interference with 13.56 MHz frequency cards. The unit includes a C-shaped thumb notch at the base for manual card extraction and an integrated spring-steel clip on the reverse side for securing paper currency.